3139			Null statement is obscured by code or comment on the same line.
	Readability

• it is on a line by itself (before preprocessing)
• it is actually derived from expansion of a macro
• it follows expansion of a macro which terminates with a "}" or ";"

/*PRQA S 2212,2213,2214,3109,3138,3140,3141,3412,3227,3408,3431 ++*/

#define NOTHING
#define MACRO1 {}
#define MACRO2 ;

extern void foo(int n)
{
    int i;

/***************************
Message 3139 will not be
generated on the null statements
in the following code
***************************/

    if (n == 1)
        ;
    NOTHING;
    NOTHING; /* ... */
    MACRO1;
    MACRO2
    MACRO2;

/***************************
Message 3139 will be generated
on all null statements in the
following section
***************************/

    if (n == 1);

    for (i = 0; i < n; ++i);

    {};

    ;;
    /* ... */ ;;  /* ... */
    ;  /* ... */
    /* ... */ ;
}

See also:

• 3109 Null statement follows other code on the same line.
• 3138 Null statement is located close to other code or comments.
• 3140 Null statement occurs on a line by itself.
• 3141 Null statement does not occur on a line by itself.